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// Variable Declaration
X_s = 6.0 //Synchronous reactance of alternator(ohms/phase)
pf = 0.8 //Lagging power factor
P_G = 5.0 //Power delivered(MW)
V = 11.0 //Voltage of infinite bus(kV)
// Calculation Section
delta = acos(pf)
I = P_G*1000/(3**0.5*V*pf)*(pf - complex(0,sin(delta))) //Alternator current(A)
V_b = V*10**3/3**0.5 //Voltage of infinite bus(V/phase)
E = complex(7531.79669352,1574.59164324) //Initial excitation voltage(V)
pf_n = 1.0 //New power factor
P_Gn = P_G //New power delivered(MW)
I_n = P_Gn*1000/(3**0.5*V*pf_n) //Alternator current(A)
E_n = complex(V_b,I_n*X_s) //New excitation voltage(V)
excitation_change = (abs(E)-abs(E_n))/abs(E)*100 //Percentage change in excitation(%)
// Result Section
printf('Percentage change in excitation = %.2f percent' ,excitation_change)
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